The correct answer is A) expect a daymark of no lateral significance. The Light List indicates that a dayboard is a type NB, which means it is a "Dayboard, No Lateral Significance". This means that the dayboard is not used to indicate the side of the channel that should be kept, but rather serves as a reference point or landmark. It does not have a specific meaning in terms of navigating the channel. The other answer choices are incorrect because B) looking for another daymark forming a range, C) checking to enter the correct channel at the junction daymark, and D) seeing a black triangle are not the appropriate responses for a type NB dayboard as described in the Light List.